Molding apparatus for stator of rotary electric machine

Abstract

A molding apparatus for molding a coil of a stator of a rotary electric machine having a novel construction for fitting the stator readily to its mold enabling the molding operation to be continuously performed without interruption even if the thickness of the stator shows variations when fitted to the mold. The molding apparatus includes a pair of mold members, one mold member enclosing one coil end of the stator having a stator core and a coil wound thereon with a clearance therebetween and positioned against one end surface of the stator core disposed outwardly of the one coil end and the other mold member set on the inner periphery of the stator core and enclosing the other coil end of the stator with a clearance therebetween while being positioned against the other end surface of the stator core disposed outwardly of the other coil end. The two mold members are prevented from striking each other when the stator core is held therebetween. A plurality of runners are formed on the other mold member for communicating a first space formed between the first mold member and the one coil end with a second space formed between the second mold member and the other coil end.

What is claimed is: 
     
       1. A molding apparatus for a stator of an electric rotary machine comprising: a first mold member enclosing one coil end of the stator including a stator core and a coil wound thereon with a clearance therebetween and positioned against one end surface of the stator core disposed outwardly of said one coil end;   a second mold member set on the inner periphery of the stator core and enclosing the other coil end of the stator with a clearance therebetween while being positioned against other end surface of the stator core disposed outwardly of said the other coil end; and   at least one runner formed on said second mold member for communicating a first space formed between said first mold member and said one coil end with a second space formed between said second mold member and said the other coil end.   
     
     
       2. A molding apparatus for a stator of an electric rotary machine comprising: a first mold member enclosing one coil end of the stator including a stator core and a coil wound thereon with a clearance therebetween and positioned against one end surface of the stator core disposed outwardly of said one coil end;   a second mold member set on the inner periphery of the stator core and enclosing the other coil end of the stator with a clearance therebetween while being positioned against the other end surface of the stator core disposed outwardly of said the other coil end, said second mold member being prevented from coming into direct contact with the first mold member when the stator core is held between the two mold members; and   at least one of runner formed along the surface of said second mold member and opening at the inner peripheral surface of the stator core for communicating a first space formed between the first mold member and said one coil end with a space formed between the second mold member and said the other coil end.   
     
     
       3. A molding apparatus as claimed in claim 2, wherein said runners formed on said second mold member are disposed along the cylindrical surface of the core set on the inner periphery of the stator core. 
     
     
       4. A molding apparatus as claimed in claim 2 or 3, wherein said runners open at the inner peripheral surface of the stator core other than the position of the opening of a slot of the stator core. 
     
     
       5. A molding apparatus for a stator of a rotary electric machine comprising: a first mold member enclosing one coil end of the stator including a stator core and a coil wound thereon with a clearance therebetween and positioned against one end surface of the stator core disposed outwardly of said one coil end;   a second mold member set on the inner periphery of the stator core and enclosing the other coil end of the stator with a clearance therebetween while being positioned against the other end surface of the stator core disposed outwardly of said the other coil end, said second mold member being constructed such that when the stator core is held between the first mold member and the second mold member in a closed mold position a portion of the second mold member fitted to the inner periphery of the stator core is prevented from striking the first mold member with a force higher than a mold clamping force applied to the closed mold; and   at least one of runner formed along the surface of said second mold member and opening at the inner peripheral surface of the stator core for communicating a first space formed between said first mold member and said one coil end with a second space formed between said second mold member and said the other coil end.   
     
     
       6. A molding apparatus as claimed in claim 5, wherein said second mold member includes a core fitted to the inner periphery of the stator core, and a spring member for forcing said core against the first mold member with a biasing force lower than the clamping force applied to the closed mold members. 
     
     
       7. A molding apparatus as claimed in claim 5 or 6, wherein said runners open at the inner peripheral surface of the stator core other than the position of the opening of a slot of the stator core.